Hand-operated blower



l Patented Jun@ 12,1923.

" 1mi TED.- s'raras "Parana WILLAM Jnwn'r'r, yor nIoH'lvroN-D, 'VIRGINIA 'HAND-OPERATED ieLoWEn.

l ppncation .fnedocteber 22, 1921. semi No. 509,511.A y

. equally distributed against.the blades vand against the `inner walls (of the-casing', and as a consequence serve :to retard f the free turning of the Y,blast fan vin the casing, :such currents frequently causing a back .pressure against the fan blades, and at all times, incident to the resistance oered thereby add to the laborin a manually operated blast blower. From experience, I vhave found that by arranging on the outer face of the fan housing a. casingof a particular and peculiar shape and construetion'that the currents of air can be so admitted and directed against the fan blades or wingsvas to impart an added impetus in the revolution thereof, and consequently materially reduce the manual force employed in turningthe fan, and it may therefore be considered the primary object of this invention to provide a blast fan housing or casing with a means for freely admitting air therein in a manner which will assist the revolving of the blast fan therein.

Other objects and advantages will present themselves as the nature of the invention is better understood, reference being had to the drawings which accompany and which form part of this specification.

In the drawings l Figure l is a front elevation ofthe head portion or housing of a blast fan illustrat? ing the application of the improvement.

Figure 2 is a sectional view on the line 2 2 of Figure 1.

Figure 3 is a plan view of the improvement looking toward the inner face thereof. Referring now to the drawings in detail, the numeral 1 designates the head portion or housing of an ordinary blast fan, the same being provided, in the usual manner,

with the integral exhaust nozzle portion 2.

The housing 1 has its outer face centrally provided with an air admitting opening 3,

lward inclination from the inner wall l thereof, the top and bottom walls 8 andf9 re-v 'l f .and the housingv thereis arrangedforfro- Y g tary movement a blast fan .which hasjits.y vblades' a? Constructed in the .usualymanner vided with the usual worm (not shown) i vwhich is engagedby a worm wheel thatis actuated by a 'train ofsgears Y(iperatedlby fa handle in the usualv manner.Y :As the gears vdo not formvthe subjectinatterofthisjinvention the same have not been illustrated iin memberis hollow andy yisin the fnatur'erofva substantially rectangular casing. {[h'e vouter the ldra-wings,,randhave been merely referred wall 6 of the casing'isianranged ,fat out# -i spect-ively, having their edges 4thus arranged at an angle. The outerwall 6 terminates a. y

distance inwardly from the inner wall, .and therefore the top and bottom walls 8and9 have their outer ends also cut at an angle;

This arrangement provides the casing with a flared air entrance mouth 10. The inner wall 7 does not extend the casing, but terminates at a poi the center ofthe openingpa closed in Figure 2 of the drawings. l The top and bottom walls on their inner edges have'l ears 11 through which pass securing elements .1n the nature ofbolts or screws 12.

The` cut away portion of the inner wall provides the casing l-with an opening 14 v length of the lOn the lower wall 9 ofthe housing I ari range a plurality of upwardly arched .air directing members 15 and 16 respectively,

the member 15 being of a less length and'k ranged above the memberl', andthe member 16 is in a line with theportion of the wall of the opening 3. The member 16 is also preferably of a. greater width than the .i i

member 15, and these upwardly arched members are designed'to direct the currents offair whichv enter the mouth 10 of .the casing against the fan blade 4 disposed oppositethe said director members, and consequently cause such current of air to givev anvadded impetus to the fan in the 4.turning thereof.

In order that such currents of air shallbe positively forced into the housing through the opening 3, I arrange upon the top wall 8 of the casing 13 a downwardly arched deiector plate 17 that has its ends terminating approximately in a line with the end of the arched director member 16, the said deflector being also in a line with a portion of the wall of the opening 3.

It is thought that the foregoing description, when taken in connection with the drawings will fully set forth the construction, operation and advantages of the improvement to those skilled in the art to which such inventions relate, and therefore further detailed description is not believed necessary. It is, however. thought well to state 'that' the description and drawings refer to only a satisfactory embodiment of the improvement as it now' appears to me and Atherefore I am entitled to make all such blast blower having an opening communicating with its fan chamber; of a casing having a ared entrance mouth arranged transversely over and "partly Vcovering the opening, spaced upwardly 'arched members secured to the bottom of the casing for directing air posed at an outward angle with respect to its inner wall to provide a flared air entrance mouth, the inner wall being of a less length than the outer wall and only partly closing the opening in the housing, the lower wall of the casing having a plurality of spaced upwardly arched `air current directors one of which being arrangedin a line with the wall of the opening in the housing, and the upper wall of the casing having a downwardly arched deflector which is also arranged ina line with the opening in the housing.

In testimony whereof I afliX my signature. I WILLIAM JEVVETT. 

